Evaporator Drain Tube: Testing and Inspection

Condensation Water Drain Hose, Checking

• Only one condensation water drain hose is installed in this vehicle.

• On vehicles with heating (without A/C system), a sealing plug is installed to seal the opening on the body center tunnel (no condensation water hose is present).

• There is no valve and no door at the end of the condensation water hose - C -.






• For complaints of moisture in passenger compartment, check the following as well as condensation water drain:

- Plenum chamber water drain. Refer to=> [ Plenum Chamber Water Drain, Checking and Cleaning ] Service and Repair.

- Plenum chamber cover and cover for fresh air intake housing for correct installation and damage. Refer to=> [ Fresh Air Intake Cover ] Fresh Air Intake Cover.

- Dust and pollen filter for soiling and correct installation. Refer to=> [ Dust and Pollen Filter ] Service and Repair.

- Forced air extraction vents in luggage compartment. Refer to=> [ Passenger Compartment Forced Air Extraction, Checking ] Testing and Inspection.

- Activation and function of back pressure door. Refer to=> [ Air Flow Door Motor (V71), Function ] Air Flow Door Motor (V71), Function and recirculating air door => [ Recirculation Door Motor (V113) ] Recirculation Door Motor (V113) and Vehicle diagnosis, testing and information system (VAS5051B) under "Guided Fault Finding".

• Also, if there is a complaint about moisture in the passenger compartment that only occurs when the is A/C compressor is switched on and under certain environmental conditions, check the output temperature of air from the evaporator using Vehicle diagnosis, testing and information system (VAS5051B) under "Guided Fault Finding".

- Guided Fault Finding, in "read measured values block", select the measured value for evaporator vent temperature sensor (G263).

- Check output temperature of air at evaporator under conditions reported by customer or at the following setting on the Climatronic control module (J255) , "Auto" operating mode, A/C compressor switched on (control light in A/C button lights up), temperature setting "Cold", middle fresh air blower speed at a voltage of approximately 7 volts on the Fresh Air Blower (V2) , fresh air mode (indicator light "recirculation button" does not light up) and open instrument panel vents, the air vent temperature at the evaporator.

- If the evaporator vent temperature sensor (G263) measured value is too low (colder than 0 °C for a long period of time when the ambient temperature is above 0 °C) or too high (even though the A/C is working correctly, for example: higher than 10 °C), correct the cause for the difference. Follow the procedure for checking the cooling output. Refer to => [ A/C Unit, Checking Cooling Output ] A/C Unit, Checking Cooling Output.

Condensation water hose, removing, checking

- Remove left and right center console trim and front center console.

- Carefully fold back the carpet near the condensate drain hose just enough until the drain is visible.






- Make sure the condensation water drain - B - is routed correctly and is not block with dirt or constricted.

- Cover area beneath opening - D - for condensation water drain - C -) with absorbent paper (so that any water present does not flow under carpet).

- Remove condensation water drain - B -.

- Check condensation water drain of A/C unit - A - for soiling (e.g. using a piece of wire).

- Check the distance between the insulation mat installed in the center tunnel and the end of the drain hose - B - for the condensation water - C - above the opening - D - in the floor panel. There must be enough distance so that the water can drain out of the hose - C -.

Installing

Installation is carried out in the reverse order while observing the following.

- Install the condensation water drain - B - so that it is not twisted or pinched.

- When installing the carpet, take special care that it does not compress the condensation water drain - B -.